---
title: 'API Key'
description: 
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## MCP Servers that require API Key Authentication

The following MCP servers use API key authentication and do not support OAuth:

- **Cloudflare** - Requires Cloudflare API token
- **Discord** - Requires Discord bot token
- **ElevenLabs** - Requires ElevenLabs API key
- **PostHog** - Requires PostHog API key
- **SendGrid** - Requires SendGrid API key